wp-includes/user.php:5167Sets the last changed time for the 'users' cache group.
function wp_cache_set_users_last_changed() { wp_cache_set_last_changed( 'users' );}Introduced in 6.3.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/user.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.